Zero-voltage switching multioutput flyback converter with integrated auxiliary buck converter

This paper presents a new multioutput converter. It consists of a half-bridge inverter in primary side and a flyback rectifier that is integrated with an auxiliary buck converter in secondary side. The primary switches control the main output voltage and the secondary synchronous switches control the auxiliary output voltage. The main advantages of the proposed converter are that the transformer size can be reduced due to the lower magnetizing offset current, all the switches including synchronous ones can achieve the zero-voltage switching, and it has no cross regulation problems. The operational principle, analysis, and design considerations of the proposed converter are presented in this paper. The validity of this study is confirmed by the experimental results from dual-output (24 V/8 A and 12 V/4 A) prototype.